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Show Notes
We picked up a Gravis Advanced (https://www.mocagh.org/loadpage.php?getgame=gravis-front) PC analog joystick to verify our design for an adapter board is all peachy-keen. after some confusion about the way buttons work - turns out you DON'T want the knobs on the side centered because that disconnects the switches from the DE-15 - we have some success! since the X and Y positions are changed by the joystick moving the wiper on two pots (https://allpinouts.org/pinouts/connectors/input_device/joystick-pc-gameport/) and not by a voltage divider, we have to do a tiny bit of math to figure out the actual resistance. so far this board works very nicely and will let some of those old joysticks live again in modern projects. here we have a QT Py reading the values, and it would be trivial to convert this to a USB HID keyboard, mouse or joystick interface.
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